Which of the following is a Brønsted-Lowry base?

A- HCl

B- HCO

C- H3O+

D- H3PO4

C. H₃O⁺ is a Bronsted Lowry base.

Explanation:

Any substance that accepts hydrogen ions or (H⁺) ions or protons during any chemical reaction is termed as a Bronsted Lowry base.

Here HCl donates a proton so it is not a Bronsted Lowry base.

HCO is also not a Bronsted Lowry base.

H₃O⁺ is a Bronsted Lowry base because it accepts H⁺ ion from one of its reactant.

H₃PO₄ is also not a Bronsted Lowry base.

So option C. H₃O⁺ is a Bronsted Lowry base.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2